Punching press and die therefor



R. 5. SMITH A r F7," 1923.

PUNCHING PRESS AND DIE THEREFOR Original Filed Oct. 2C 1919 Patented Apr. 17, 1923.

lTED STATES REUBEN STANLEY SMITH,

coarom'rron, or mnw F MILWAUKEE, WISCONSIN, ASSIG-NOR TO A. 0. SMITH AUKEE, WISCONSIN, A CORPORATION OF NEW YORK.

PUNCHING PRESS AND DIE THEREFOR,

Application filed October 20, 1919, Serial Ito. 831,995; Renewed January 25, 1923.

To all whom it concern Be it known that I, REUBEN STANLEY SMITH, a citizen of the United States, and

residing in the city of Milwaukee, county of Milwaukee,

have invented a and State of Wisconsin, new and useful Improvement in lunchillg Presses andDies Therefor; and I do declare that the following is exact description thereof,

a full, clear,

and

such as will enable persons skilled in the art to which the invention pertains to make and use the same drawings hereto unchin rivet holes in the reference being had to the attached and forming part cation for disclosure as to certain details of construction and operation.

This invention relates to presses for flanged side end and cross bars of automobile and other vehicle frames.

The invention of multiple punching consists of a novel form press and double face fore known.

die. bars, the fl from the strain incident die in the forms hereto- In the former practice, when the flanges are punched separately, strain is imposed upon the entire punching the sup ort for the At places in the length 0 the flanged anges are in such proximity that the channel between them is very much restricted, and

this has necessitated the use of a die of such corresponding small proportions that an element construction But in my which are simultaneously applied at 0 site sides of of weakness in the is unavoidable.- v

invention, the punching strains P the flanged bar, are resisted by the die which is in the channel of the flanged bar a equalizing the pressure t the time. The result of thus is that the whole of the crushing strains imposed by the press are borne by the the die-is entirely strains.

In some classes die, and the Support for of work, it'is desirable to perforate. the web of the flanged bar upon a line coincident with the perforations in and this may be effected by prothird punchhole in of. In such cases, the three the flanges,

viding the die with a M the top there relieved from any such ress are actuated simultaneownward pressure of the punches of the ously. The

third punch does not impose any lateral strain upon the strain is merely one ofcompression exerted support for the die, but such invention, the latterwill now be described j with reference to the form in which its novel features have been specifically embodied, and such novel features will be, recited in-the claims appended to this specification;

In the accompanying drawings,

Figure 1 is a view in front elevation, broken away. in parts and sectioned in other parts, showing my improved form of punching press and die. tion of the pressures, whereby the support for the die is freed to the use of the Figure 2 is view in front elevation,

"partly in'section, showing in an enlarged manner the structural features used in the of the die rcss shown in which em Figure 1,and ies my inventio Figure v3v is in elevation, partly in section and similar to Figure 1, showing simple PI'OVISIOIIS, in a press designed to perforate the web and, the side flanges jof a bar at one operation.

Like reference letters indicate the same parts-in the several views. t

Referring to the drawings, the main frame of the punching press is indicated by the letter'A Upon the top of this frame and at a central point is mounted an anvil or die B, against which the punches C work in direct opposition to each other when in operation, to pierce rivet gangs of the bar D, when laid upon the The anvil or die B, formed as a solid block, is bored from opposite faces to provide openings 6, 6, into which are passed the slugs punched from the side flanges of the bar D, by the punches C, and is bored also at b, to provide a central or common discharge chute through which such slugs may be carried from the press.

The top of the frame is grooved as at (1,

holes in the side to provide ways in which are guided the .tween the pinion g, and each of the shafts F.

By this arrangement, the punchesC are operated in synchronism, and are effective to perform their work of punching a rivet hole in each of the flanges of the bar D, at the same instant.

Itfollows from the operation described, that the thrust of the punches is'equalized, and that the pressure exerted is wholly absorbed by the die B as an intermei'liary, without imposing any strain upon the support or attaching means for the said die.

In some classes of work, the channelled bar is so narrow at its ends that the opposite flanges thereof are separated only by a slight distance. which is not sufficient to permit the use of an anvil or horn of sufficient strength to withstand the pressure of the punching mechanism, when the latter is exerted. As a result, the stains upon the anvil and its support are so great that fracture frequently results. However, I propose to overcome the objection referred to by forming a double faced anvil or die which corresponds exactly in thickness to the distance separating the flanges of the chanhclled bar. This improved anvil will stand entirely clear of the other partsso that the .field comprising the space defined by the. projected parallel lines of the opposite side faces against which the. punches operate in synchronism is entirely free from obstruction by any part of the mechanism, and accordingly the channelled bar may be passed over theanvil and seated thereon with the opposite faces of the anvil in engagement with the flanges of the bar without hindrance by said mechanism or parts thereof. In punching, the strains are transmitted directly to the anvil. so that the stresses offset and neutralize each other and relieve the support for the anvil from the breaking strains heretofore encountered. This arrangement of the anvil in free space is desirable to enable the movement of the channelled bar to take place so as to position the latter upon the anvil without encounter.- ing obstructions. It is necessary to the successful practice of the invention that the anvil head stand in a lane which is clear and above the mechanism of the press to facilitate the longitudinal movement of the bar and the seatingthereof on the anvil for the performance of the multiple punching operation.

It is also necessary that the anvil or die members be formed as a solid. block, so as to withstand the crushing strains imposed thereon by the simultaneously operating punches, in'order that the destructive infiucnces due to the'heavy pressuresmay be avoided, such pressnncs, as before indicated, being sufficient to fracture the anvil or de stroy its support. The anvil or die member will be of such proportion that. notwithstanding the presence of the openings and chute therein its solidity will resist the crushing strains exerted by the pressure of the punches upon the heavy material of which the channelled bar is formed.

As hereinbefore indicated, in certain classes of work, it is desirable to perforate the web of the bar upon the line of the holes in the flanges, and this may easily be achieved by the simultaneous operation of a third punch, through the devices shown in Figure 3, the plurality of punches thus employed operating with a concentering move ment against the flanges and the web of the channel bar.

A sub-frame A will be mounted on the main frame A, for guiding the punch C, and supporting short shafts/1. which latter form journals for the oscillating levers H. The shafts l carry additional eccentrics P", which vibrate the pivoted levers H, and impart reciprocatory motion to the punch. C, the adjacent ends of the levers H, being suitably connected to the shank of the punch C, so as to produce the desired movements of the latter. In Figure 3, I have shown such connection as comprising pins 0 in the shank of the punch C, as working in slots o in the forked ends of the oscillating levers H. The punch C cooperates with the punch hole 7), in the die B.

I am aware that it has been attempted heretofore ito punch opposite holes in the flanges of a channel bar, but in such previous efforts no attempt has been madeto use a double face hollow die or its equivalent, as in-my invention.

I am also aware that it has been attempted heretofore to punch opposite holes in pipes composed of thin sheets. a circular skeleton die member over which .the pipe is passed being employed to receive the thrust of the punches; but the construction is such that obstruction exists to the longitudinal movement of the !work. and it is not therefore layvailable for piercing the flanges of channel ars.

Having thus described my invention, what I claim and desire to secure. by Letters Patent is:-

1. In a piercing press for punching holes in the opposite flanges of a channeled bar,

Ill)

a frame, and a plurality of punches therein working simultaneously toward each other to offset and neutralize the opposed strains in punching, in combination with an anvil or die member fixed in the frame between the punches, the said anvil or die member being formed as a solid block upon which the channeled bariis placed with the opposite flanges of the said channeled bar engaging the side faces of the anvil, the said anvil having a bore for each punch and a common discharge chute connected with and lead ing from the bores, whereby the slugs produced in punching are guided away fromthe press.

2. In a piercing press for simultaneously punching holes in the opposite flanges of a channeled bar, an anvil or die member formed as a solid block. provided with a discharge chute for the slugs, two opposite sides of which anvil are adapted to bear against the flanges when the channeled bar is seated thereon to resist and neutralize the strains imposed upon the anvil in the punching operation, the said anvil standing in clear space to enable the channeled bar to he passed thereover without obstruct-ion.

3. In a piercing press for punching holes in the opposite side flanges of a channeled bar, an anvil or die over which the channeled bar may he passed longitudinally and upon which it may be positioned with its flanges embracing the side faces of the anvil, whereby the anvil receives the thrusts and is relieved from the opposed strains in punching. the said anvil being formed asa solid block with bores in its side faces cooperating with the punches and a common discharge chute connected with and leading from the said bores-to guide the punched slugs away from the press.

4:. In a piercing press for punching holes in a flanged bar, a plurality of punches arranged for concentering movement against the flanges and the web of the said bar to ing die fixed thereon and standing in open space to permit the channeled bar to be passed thereover and laid thereon with its flanges engaging the opposite faces of the anvil, punches and actuating means therefor supported by the frame at each side of the anvil or die, whereby the strains exerted by the opposing forces of the punches upon the support for the fixed anvil or die are equalized, the said anvil or die being provided with openings in which the punches work and a discharge chute for the punched slugs leading from the several openings.

6. In a piercing press for punching holes in the opposite flanges of a channeled bar, a frame, punches therein. and means for actuating the punches simultaneously toward each other to neutralize the opposed strains in punching. in combination with an anvil or die member arranged between the punches, the said anvil or die member being formed .as a solid block upon which the channeled bar is adapted to be placed with the opposite flanges thereof in engagment with the sides of the anvil, and provided with means for conducting away the slugs punched from the said flanges.

In testimony whereof, I have signed my name at Milwaukee, this 9th day of October, 1919.

R. STANLEY SMITH.

Witnesses:

W. F. WOOLARD, C. THEO. OSTERBERG. 

